JP2002301309A - Filter plate for filter press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize the dehydration ratio of dehydrated cake. SOLUTION: A vibration exciter 30 for applying a prescribed vibration to the dehydrated cake is provided on a filter plate 10. The vibration exciter 30 is provided with a vibration exciting body 30a, in which a steel-made ball rotating at a high speed by compressed air is incorporated, an air supply pipe 30b for supplying the compressed air to the vibration exciting body 30a and an air discharge pipe 30c for the compressed air supplied to the vibration exciting body 30a. The vibration exciter 30 is used by 5 sets each having the same constitution on one filter plate 10 and three sets are arranged at an equal interval on the upper side from the center of the filter plate 10 and the remaining two sets are arranged on the lower side from the center of the filter plate 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a filter plate for a filter press, and more particularly to a technique for improving the properties of a dewatered cake.

[0002]

2. Description of the Related Art Stabilizing liquid for ground excavation mixed with excavated earth and sand and muddy water mixed with excavated earth and sand used in muddy water shield construction are reused by removing solids such as excavated earth and sand. A filter press is known as a solid-liquid separation device used for such an application.

[0003] A filter press of this type is constructed by laminating a plurality of flat filter plates having recesses on both surfaces at a central portion in a face-to-face arrangement with a filter cloth interposed therebetween, and forming a pair of adjacent flat filter plates. The filter chamber is separated by making the recesses of the plate communicate with each other, treated water is introduced into the inside of the filter cloth interposed in the filter chamber, and the treated water is filtered by the filter cloth, whereby the dewatered cake and the filtration Separate with water.

However, the conventional filter press has the following technical problems.

[0005]

That is, the conventional filter press attempts to increase the dewatering rate of the dewatered cake by pressurizing the treated water fed into the filter chamber with a pump. Looking at the properties, although the dewatering rate on the surface side of the dewatered cake is considerably large, the dewatering rate near the center is low, and unevenness of the dewatering rate is recognized.

[0006] Such non-uniformity of the dehydration rate is, for example, as follows.
In relation to the excavation speed, when the treatment time of the treated water is extremely shortened, or when the properties of the excavation ground change, the tendency tends to become more remarkable.

[0007] The present invention has been made in view of such conventional problems, and an object of the present invention is to provide a filter plate for a filter press, which can make the dewatering rate of a dewatered cake uniform. It is in.

[0008]

In order to achieve the above-mentioned object, the present invention provides a method of forming a plurality of flat filter plates having concave portions on both surfaces at a central portion thereof in a face-to-face arrangement with a filter cloth interposed. Laminated, separating the filter chamber by communicating the recesses of the pair of adjacent flat filter plates with each other, introducing treated water into the inside of the filter cloth interposed in the filter chamber, In a filter press for separating the dewatered cake and the filtered water by filtering the treated water through the filter cloth, a vibrator for applying a predetermined vibration to the dewatered cake was provided in the flat filter plate.

According to the filter plate for a filter press constructed as described above, the vibrator for applying a predetermined vibration to the dewatered cake is provided in the flat filter plate. It is promoted and the dehydration rate can be made uniform.

[0010] A plurality of the vibrators can be arranged on the bottom surface of the concave portion of the flat filter plate.

The vibrator can be constituted by a vibrator which rotates at high speed by injection of compressed air and generates vibration by centrifugal force.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 4 show an embodiment of a filter plate for a filter press according to the present invention.

The filter plate 10 of this embodiment is used for the filter press 12 shown in FIG. 1. The filter press 12 includes a plurality of filter plates 10 and a plurality of filter cloths 1.
4, a receiving plate 16 and a tightening plate 18.

As shown in detail in FIG. 3, the filter plate 10 is a flat plate formed in a square shape and has a main body 10a.
Along the outer peripheral edge of the main body 10a, there are provided annular convex portions 10b protruding on both sides thereof, and concave portions 10c are provided on both surfaces at the center.

At the center of the main body 10a of the filter plate 10, a circular circulation hole 10d for introducing the treated water A is formed. A pair of filtration ports 10e serving as discharge ports are formed through.

A draining net 10f is attached to the surface of the main body 10a, which is the bottom of the recess 10c, so as to cover the entire surface.

The filter cloth 14 is formed in a shape in which square-shaped ones having substantially the same size as the filter plate 10 are connected by one side on the upper end side, and a through-hole corresponding to the flow hole 10d is provided in the center. The periphery of the through hole is fixed to the outer periphery of the flow hole 10d of the filter plate 10.

Each filter cloth 14 is supported at its upper end by a spring 22 provided on a filter cloth suspension rod 20 supported at the upper end of the filter plate 10. By adding, it is becoming taut.

The several filter plates 10 constructed as described above
As shown in FIG. 1, a filter cloth 1 is provided between each filter plate 10.
4 are laminated in the front-rear direction in a face-to-face state with the interposition of a receiving plate 1 and a receiving plate 16 and a tightening plate 18 at both ends.
The filter press 12 is assembled so that the filter cloth 14 is sandwiched between the filter press 6 and the tightening plate 18.

When the filter press 12 is assembled in this manner, the concave portions 10c of the respective filter plates 10 are communicated with each other between a pair of adjacent filter plates 10 stacked in the front-rear direction to separate them from the outside. A filtered chamber 24 is formed.

When a plurality of filter plates 10 are stacked in the front-rear direction, the flow holes 10d are communicated with each other, and an introduction path for the treated water A is formed at the center of the filter plates 10 and separated by the filter plates 10. The filtered chamber 24 is communicated and connected via the flow hole 10d.

The filter cloths 14 are interposed in the respective filter chambers 24. When the treated water A is introduced through the flow holes 10d, the treated water A enters the inside of the filter cloths 14, When the treated water A is pressurized, it passes through the filter cloth 14 and is discharged to the outside.

When the treated water A permeates through the filter cloth 14, the solid content in the treated water A becomes a cake, remains inside the filter cloth 14, and the filtered water B from which the solid content is filtered is Filtration port 10e
Is discharged to the outside through

When the treatment of the treated water A is continued, the cake is gradually deposited on the inside of the filter cloth 14, and the cake is dehydrated as the cake is deposited. When a predetermined dehydrated cake C remains between the cloths 14 and is obtained,
When the introduction of the treated water A is stopped and the frame of the filter plate 10 is opened and the frame is opened, the dehydrated cake C falls downward and the treatment of the treated water A is completed.

The basic structure and processing operation of such a filter press 12 are substantially the same as those of a conventional apparatus of this type. There is a remarkable feature in the point described above.

That is, the filter plate 10 of this embodiment is provided with a vibrator 30 for applying a predetermined vibration to the dewatered cake C. In this embodiment, a vibrator driven by compressed air is provided. 30 are employed.

The vibrator 30 includes a vibrator 30 a containing steel balls which rotate at high speed by compressed air, and a vibrator 30.
a air supply pipe 30b for supplying compressed air to the
0a.

In the case of the present embodiment, the vibrator 30 has the same configuration, and five vibrators are used for one filter plate 10, and three vibrators 30 are provided above the center of the filter plate 10. The two pieces are arranged at substantially equal intervals, and the remaining two pieces are arranged below the center of the filter plate 10.

The number of the vibrators 30 does not need to be limited to five, and may be appropriately selected according to the size of the filter plate 10 and the like. In the main body 10a of the filter plate 10, a total of five concave vibrator storage chambers 32 each having an open end are provided in accordance with the arrangement of the vibrator 30.

The vibrator 3 housed in each vibrator housing chamber 32
0a indicates that the air supply pipe 30b and the exhaust pipe 30c are individually connected in series, respectively.
The end of c is open on one side of the filter plate 10, and the end of the air supply pipe 30b is connected to a compressor (not shown).

The vibrating body 30a housed in each of the vibrating body housing chambers 32 is fixed by bolts 34 to a drain net 10f provided so as to cover the opening side of the vibrating body housing chamber 32.

In the vibrator 30 configured as described above, when compressed air is supplied to each of the vibrators 30a through the air supply pipe 30b, vibrations are generated in the vibrators 30a. The water is transferred to the dewatered cake C deposited in the filter cloth 14 via the drainage net 10f.

When such vibration is applied to the dewatering cake C, the vibration causes the earth and sand particles in the dewatering cake C to move delicately, thereby narrowing the interval between the particles, and consequently consolidating the dewatering cake C Can be achieved.

According to the filter plate 10 for a filter press constructed as described above, since the vibrator 30 for applying a predetermined vibration to the dewatered cake C is provided in the flat filter plate 10, the vibration When the machine 30 is driven, vibration is applied to the dewatered cake C generated between the filter plates 10, whereby the consolidation of the dewatered cake C is promoted, and the dewatering rate can be made uniform.

In this case, the driving of the vibrator 30 is performed by supplying the compressed air to each of the vibrators 30a. However, the driving can also be performed continuously from the initial stage of the generation of the dewatered cake C. Alternatively, the vibration may be applied intermittently at predetermined time intervals.

When the vibrator 30 is driven to open the frame with the interval between the filter plates 10 widened, the dewatered cake C is removed from the filter cloth 14.
, And can be used as an auxiliary mechanism when the dewatered cake C is separated from the filter cloth 14.

In the above-described embodiment, the vibration exciter 30 is of the compressed air drive type.
The present invention is not limited to this, and for example, a type that vibrates by rotating and driving an eccentric weight, or a type that uses vibration of a piezoelectric element or the like may be used.

[0038]

As described above, according to the filter plate for a filter press according to the present invention, the dewatering rate of the dewatered cake can be made uniform.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of an overall configuration of a filter press using a filter plate for a filter press according to the present invention.

FIG. 2 is a plan view showing one embodiment of a filter plate for a filter press according to the present invention.

FIG. 3 is a view as viewed in the direction of arrows AA in FIG. 2;

FIG. 4 is an enlarged view of a portion B in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Filter plate for filter press 10a Body part 10b Convex part 10c Concave part 10d Flow hole 10e Filtration port 10f Drainer net 12 Filter press 14 Filter cloth 30 Vibrator 30a Vibrator 30b Air supply pipe 30b Exhaust pipe 32 Vibration body storage chamber

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kazuhiko Matoba 2-15-2 Konan, Minato-ku, Tokyo Main office of Obayashi Corporation (72) Inventor Makoto Arakawa 2-15-2 Konan, Minato-ku, Tokyo Stock Company Obayashi head office F term (reference) 4D018 AA03 AA07 AA13 BB02 BB03 BB21

Claims (3)

[Claims] 1. A plurality of flat filter plates having concave portions provided on both surfaces of a central portion are laminated in a face-to-face arrangement with a filter cloth interposed therebetween, and the concave portions of a pair of adjacent flat filter plates are arranged. Are separated from each other to separate the filter chamber, treated water is introduced into the inside of the filter cloth interposed in the filter chamber, and the treated water is filtered by the filter cloth, thereby forming a dewatered cake. A filter press for separating water from filtered water, wherein a vibrator for applying a predetermined vibration to the dewatered cake is provided in the flat filter plate. 2. The filter plate for a filter press according to claim 1, wherein a plurality of the vibrators are arranged on a bottom surface of the concave portion of the flat filter plate. 3. The filter plate for a filter press according to claim 1, wherein the vibrator has a vibrator that rotates at high speed by injection of compressed air and generates vibration by centrifugal force.